如何从表单中传递值以进行验证

Question

我正在创建表单，用于通过Ruby on Rails进行直接付款。

我有表格设置，我已经设置了一些基本的验证，以确保填写所有字段。

接下来我想设置一些验证来检查比IBAN（国际银行帐户号码）号码是一个有效的IBAN。

这涉及到几个步骤操纵一个字符串，改变它为一个数字，并做一些数学，所有我已经写了一个方法。

我的问题是，我似乎无法通过IBAN进行验证的方法。

我的验证：

class DirectDebit < ActiveRecord::Base 
attr_accessible :address, :amount, :bank_branch, :bic, :date_for_payment, :email, :iban, :name, :name_of_account, :phone 

validates :address, :bank_branch, :bic, :date_for_payment, :email, :name, :name_of_account, :phone, presence: true 

validates :amount, numericality: {greater_than_or_equal_to: 0.01} 

validate :iban 

def iban 

    ## Converts all letters in 'number' to uppercase and removes any spaces and anything else that isn't a letter, number or underscore 
    iban = iban.upcase.scan(/\w/).join 

    ## removes any underscores as ".scan(/\w/)" above reads in letters digits and underscores. 
    iban = iban.gsub(/_/, '') 

    ## Calculates the length of 'number' 
    iban_length = iban.length 

    ## Saves the first two letters in 'number' as 'country' 
    country = iban.scan(/\A../).join 

    ## Checks if the length is correct for the country 
    length_correct_for_country = true 

    case country 
     when "IE" 
      if iban_length == 22 
       length_correct_for_country = true 
      else 
       length_correct_for_country = false  
      end 
     when "AL" 
      if iban_length == 28 
       length_correct_for_country = true 
      else 
       length_correct_for_country = false  
      end 
     ... 
     when "GB" 
      if iban_length == 22 
       length_correct_for_country = true 
      else 
       length_correct_for_country = false  
      end 
     when "VG" 
      if iban_length == 24 
       length_correct_for_country = true 
      else 
       length_correct_for_country = false  
      end 
    end 

    ## Identifies what the first 4 characters are, and removes them from the rest of the number 
    first_four_characters = iban.slice!(0..3) 

    ## Adds the first four characters to the end of the rest 
    reordered_number = iban + first_four_characters 

    ## Set up an array and have each character in the reordered number read into it, changing it to the appropriate number if it is a letter. 
    letters_removed = [] 
    reordered_number.scan(/./) do |character| 
     case character 
     when "A" 
      letters_removed << 10 
     ... 
     when "9" 
      letters_removed <<9 
     end 
    end 

    ## Change the array to a String and then to a number 
    letters_removed = letters_removed.join.to_i 

    ## Check to see if it gives a remainder of one when divided by 97 
    remainder = letters_removed % 97 

    ## Output that it is a valid number if the remainder when it is divided by 97 is 1 and if it is the correct length for the country. 
    if remainder == 1 && length_correct_for_country 

    else 
     remainder = remainder.to_s 
     errors.add(:iban, " That is not a valid IBAN. The IBAN that is being supplied is: " + special) 
    end 

end 

end 

Answer 1

在您的模型中，iban已经是一种方法，因为它是一个数据库列。所以，你想要做的事，如：

validate :valid_iban? 

def valid_iban? 
    ## all of your current validation iban goes here 
end 

如果您希望能够验证这两个模型的IBAN，以及潜在的其他伊班人：

应用程序/模型/ validates_iban.rb

class ValidatesIban 
    def self.valid?(iban) 
    ## all your validation goes here 
    end 
end 

，并在你的模型：

validate :valid_iban? 

def valid_iban? 
    unless ValidatesIban.valid?(iban) 
    self.errors(:iban, "is not valid") 
    end 
end 

的ValidatesIban方法的好的一面：您可以重新在别处使用。

Answer 2

试试这个：

class YourModel < ActiveRecord::Base 

    validate :your_method 


    def your_method 
    #your stuff should return true or false   
    end 

end 

希望这将有助于。

Answer 3

我想这一个覆盖得很好，但我想补充一些更多的选择：

1. 您可以使用宝石“IBAN工具”，https://github.com/iulianu/iban-tools
2. 另外，对于（SEPA）直接付款的形式/协议，试试这个sepa_king宝石这也验证了BIC和债权人标识符（你可以看到内部的IBAN它也使用IBAN工具，https://github.com/salesking/sepa_king/blob/master/lib/sepa_king/validator.rb）

干杯！